/etc/sysctl.d/freedombox.conf is in freedombox-setup 0.8ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 | # Reduce writes to flash drives
vm.laptop_mode=5
vm.swappiness=0
vm.dirty_writeback_centisecs=1500
vm.dirty_expire_centisecs=1500
# Uncomment the next line to enable packet forwarding for IPv6
# Enabling this option disables Stateless Address Autoconfiguration
# based on Router Advertisements for this host
net.ipv6.conf.all.forwarding=1
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